Physics

Physics, 08.08.2019 23:20, robert7248

Why do you think astronomers have suggested three different spectral types (l, t, and y) for the brown dwarfs instead of m? why was one not enough?

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Physics, 04.07.2019 12:30, smithcj0505

Astronomers use doppler shifts to calculate precisely how fast stars and other astronomical objects move toward or away from earth. for example the spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 centimeters on earth, might be observed at 21.1 centimeters instead. what would this difference indicate to astronomers?

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Physics, 29.07.2019 10:50, kahmir15

Laboratory experiments here on earth have determined that each element in the periodic table emits photons only at certain wavelengths. these photons are apparent to astronomers as either emission or absorption lines in the spectrum of an astronomical object, like stars in galaxies. astronomers can, by measuring the position of these spectral lines, determine which elements are present in the star itself or along the line of sight. when astronomers perform this analysis, they note that for most astronomical bodies, the observed spectral lines are all shifted to longer (redder) wavelengths. this is known as cosmological redshift and is analogous to the doppler redshift. what does this redshift indicate to us about the universe in general?

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Physics, 08.08.2019 23:20, odellbeckham7171

How do objects of spectral types l, t, and y differ from those of the other spectral types?

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Biology, 24.10.2019 20:43, JANA279

Ineed your pls giving brainliest to who answer correctly 17. the hertzsprung-russell diagram below shows how the sun is classified among the stars. a star that is several thousand times brighter than the sun with a temperature lower than 4,000 k would be classified as * a main-sequence star in spectral class b a supergiant in spectral class k a main-sequence star in spectral class k or m a white dwarf in spectral class b 18. two stars are identified on the hertzsprung-russell diagram. based on the diagram below, how do the characteristics of star 1 and star 2 compare? * star 1 is cooler and less bright than star 2. star 1 is hotter and brighter than star 2. star 1 is cooler and brighter than star 2. star 1 is hotter and less bright than star 2. 19. a hertzsprung-russell diagram is shown below. based on this diagram, which type of stars would belong to spectral class m and have the highest luminosity? * white dwarfs main-sequence stars giants supergiants 20. barnard’s star is about 5.9 light-years from the sun. the star has an approximate temperature of 2,800 k. based on the diagram below, what spectral class does barnard’s star belong to? * spectral class o spectral class b spectral class a spectral class m

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